I get every shot that I can because I travel a lot, sometimes to under-developed countries, and I want to be resistant to every fucking thing that I can be. I am collecting vaccinations to all the different travel bugs as well.
I also think this is somewhat sensible because I visit SP's and that presumably exposes me to a lot of stuff--I don't just mean STD's, it's got to be a vector for normal "harmless" diseases like the flu that I'd still rather not have.
If I were not overseas so much, though, I'd probably skip it.